.How would the SB-E Extreme compare to the H100?
Haven't we covered this already?
...I don't think this thread will ever end.

We know you are OCD... It's okay.
Seriously, I understand your concern. It's not easy to figure out the best way to go with all the choices out there.. and all the confusing information available.

How tall a cooler will fit in your Antec 900? If you have 165mm SB-E Extreme will fit.
How much room is there from top PCI slot to center of CPU? If you have 80mm SB-E Extreme will fit as it is 155mm wide.
How tall is you RAM? Will a 140mm fan fit between RAM and side cover?